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WO2017171028A1 - Feuille d'électrode, condensateur d'enroulement, procédé de fabrication de feuille d'électrode et procédé de fabrication de condensateur d'enroulement - Google Patents

Feuille d'électrode, condensateur d'enroulement, procédé de fabrication de feuille d'électrode et procédé de fabrication de condensateur d'enroulement Download PDF

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Publication number
WO2017171028A1
WO2017171028A1 PCT/JP2017/013661 JP2017013661W WO2017171028A1 WO 2017171028 A1 WO2017171028 A1 WO 2017171028A1 JP 2017013661 W JP2017013661 W JP 2017013661W WO 2017171028 A1 WO2017171028 A1 WO 2017171028A1
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WIPO (PCT)
Prior art keywords
electrode foil
foil
dividing
winding
electrode
Prior art date
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Application number
PCT/JP2017/013661
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English (en)
Japanese (ja)
Inventor
良幸 成田
和宏 長原
淳視 田中
昭二 小野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Chemi Con Corp
Original Assignee
Nippon Chemi Con Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Chemi Con Corp filed Critical Nippon Chemi Con Corp
Priority to EP17775559.2A priority Critical patent/EP3385968B1/fr
Priority to KR1020187016990A priority patent/KR101914071B1/ko
Priority to CN202310252457.0A priority patent/CN116230412A/zh
Priority to JP2017541141A priority patent/JP6723252B2/ja
Priority to CN202210290755.4A priority patent/CN114628159A/zh
Priority to CN201780005120.2A priority patent/CN108431916A/zh
Publication of WO2017171028A1 publication Critical patent/WO2017171028A1/fr
Priority to US16/029,940 priority patent/US10262807B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/04—Electrodes or formation of dielectric layers thereon
    • H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/04—Electrodes or formation of dielectric layers thereon
    • H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
    • H01G9/055—Etched foil electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
    • H01G13/02—Machines for winding capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/0029—Processes of manufacture
    • H01G9/0032—Processes of manufacture formation of the dielectric layer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/0029—Processes of manufacture
    • H01G9/0036—Formation of the solid electrolyte layer
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/145—Liquid electrolytic capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/15—Solid electrolytic capacitors
    • H01G9/151—Solid electrolytic capacitors with wound foil electrodes

Definitions

  • the present invention relates to an electrode foil used for a wound capacitor.
  • Electrolytic capacitors are composed of non-solid electrolytic capacitors in which the electrolyte is liquid, solid electrolyte capacitors in which the electrolyte is solid, electrolytes in liquid and solid, so that the dielectric film of the anode is in close contact with the counter electrode. And a bipolar electrolytic capacitor in which a dielectric film is formed on both electrodes.
  • This electrolytic capacitor is formed by impregnating a capacitor element with an electrolyte.
  • the capacitor element is formed by facing an anode foil formed of a dielectric film on a valve metal foil such as aluminum, and a cathode foil made of the same or other metal foil. And a separator is interposed between the anode foil and the cathode foil.
  • the capacitance of the electrolytic capacitor is proportional to the surface area of the dielectric film.
  • the electrode foil of the electrolytic capacitor is subjected to a surface expansion treatment such as etching, and the surface expansion portion subjected to the surface expansion treatment is subjected to a chemical conversion treatment to have a dielectric film having a large surface area.
  • surface expansion has been advanced from the surface of the electrode foil to a deeper portion.
  • the core portion of the electrode foil tends to be thinner.
  • the expanded surface portion having the dielectric film is less flexible and stretchable than the core portion. Therefore, the electrode foil in which the surface area of the dielectric film is increased is reduced in flexibility and stretchability due to thinning of the remaining core portion rich in flexibility and stretchability.
  • a wound capacitor may be employed in order to achieve both a reduction in size and an increase in capacity.
  • a capacitor element of a wound capacitor is formed by overlapping an anode foil and a cathode foil with a separator sandwiched between them and winding them into a cylindrical shape. Recent measures to increase the surface area of the dielectric film have caused a great problem in the winding property of the winding capacitor.
  • the electrode foil 101 is reduced in flexibility and stretchability by forming a dielectric film 105 by performing a chemical conversion treatment on the widened portion 103 subjected to the surface expansion treatment. Then, the electrode foil 101 with reduced flexibility and stretchability cannot be deformed like a bow, and it is difficult to wind the electrode foil 101 while smoothly curving the electrode foil 101, which causes bending in some places.
  • the concentration of bending stress during winding causes a crack 104 that breaks the core 102 in the worst case.
  • the crack 104 that also destroys the core portion 102 induces bending of the electrode foil 101.
  • the diameter of the capacitor element increases. Therefore, when the electrostatic capacity of the wound capacitor is maintained, the wound capacitor is increased in size. Alternatively, if the diameter of the wound capacitor is maintained, the capacitance of the wound capacitor is reduced. Otherwise, it will be handled as a defective product and the yield will deteriorate.
  • the present invention is an electrode foil that is difficult to generate a crack that breaks the core part during winding, while increasing the surface area of the dielectric film. Is to provide a wound capacitor, a method of manufacturing an electrode foil, and a method of manufacturing a wound capacitor.
  • an electrode foil according to the present invention comprises a strip-shaped foil, and an enlarged surface portion formed on the surface of the foil, and a core portion that is a remaining portion of the foil excluding the enlarged surface portion, and And a plurality of dividing portions that extend in the width direction of the band and divide the enlarged surface portion.
  • the dividing part may extend so as to completely traverse or partially traverse the foil.
  • the dividing part may be provided at four or more places in the range of 10 mm in the longitudinal direction of the band.
  • the dividing part may be provided with an average pitch of 2.1 mm or less.
  • the dividing part may be provided with an average pitch of 1.0 mm or less.
  • the dividing portion may have a groove width of 50 ⁇ m or less including 0 in a state where the foil is flattened.
  • the dividing portion may be formed by cracking the enlarged surface portion, and the groove width may be substantially 0 in a state where the foil is flattened.
  • a dielectric film may be provided on the surface of the enlarged surface portion and the divided portion.
  • a wound capacitor provided by winding this electrode foil is also an embodiment of the present invention.
  • This wound capacitor comprises a capacitor element formed by winding the electrode foil, the capacitor element has a core part at the winding center, and the electrode foil is wound around the core part,
  • the dividing portion may be formed on the winding center side within a predetermined radius including at least the start of winding around the winding core portion.
  • an electrode foil manufacturing method includes a step of forming an enlarged surface portion on a surface of a strip-shaped foil, and a plurality of divided portions that divide the enlarged surface portion. And extending in the width direction.
  • the foil may be further subjected to a chemical conversion treatment.
  • It may further include a step of subjecting the foil to a chemical conversion treatment after the formation of the enlarged surface portion and before the formation of the divided portion.
  • the method further includes a step of chemical conversion treatment of the foil and a step of re-chemical conversion treatment of the foil after the formation of the division portion. Also good.
  • a method for manufacturing a wound capacitor according to the present invention includes an element forming step of forming a capacitor element by winding the electrode foil, and an electrolyte for forming an electrolyte on the capacitor element.
  • An aging step for aging the capacitor element, and the aging step is performed after the electrolyte is formed by the electrolyte forming step, or the aging step is performed by the electrolyte forming step after the aging step.
  • the electrolyte is formed on a capacitor element.
  • the structure of the electrode foil which concerns on this embodiment is shown, (a) is a cutaway view along a longitudinal direction, (b) is a top view. It is a perspective view showing the capacitor element with which the wound type capacitor concerning this embodiment is provided. It is sectional drawing along the longitudinal direction of the electrode foil provided with the parting part of this embodiment. It is a cross-sectional photograph along the longitudinal direction of electrode foil provided with the parting part of this embodiment concerning Example 1. It is a photograph which shows the surface of electrode foil provided with the part of division of this embodiment concerning Example 1, a photograph long side direction is a width direction of electrode foil, and a photograph short side direction is a longitudinal direction of electrode foil. . 4 is a cross-sectional photograph along the longitudinal direction of an electrode foil according to Comparative Example 1.
  • FIG. 2 is a photograph of a capacitor element in which Example 1 and Comparative Example 1 are wound.
  • 4 is a graph showing currents flowing in the aging process of the wound capacitors of Example 1 and Comparative Example 1 for each elapsed time. It is sectional drawing along the longitudinal direction of the conventional electrode foil.
  • the electrode foil 1 shown in FIG. 1 is used for an anode foil of a wound capacitor, a cathode foil on which a dielectric film 5 is formed, or both.
  • a typical example of a wound capacitor is an electrolytic capacitor.
  • an electrolytic capacitor a non-solid electrolytic capacitor in which the electrolyte is liquid and a dielectric film is formed on the anode foil, the electrolyte is solid, and the dielectric is applied to the anode foil.
  • the solid electrolytic capacitor in which a film is formed and the electrolyte include a hybrid electrolytic capacitor having a liquid and a solid, and a bipolar electrolytic capacitor in which a dielectric film is formed on both an anode foil and a cathode foil.
  • the electrode foil 1 is made of a valve metal such as aluminum, tantalum, titanium, niobium and niobium oxide. The purity is preferably about 99.9% or more for the anode foil and about 99% or more for the cathode foil, but may contain impurities such as silicon, iron, copper, magnesium, and zinc. As shown in FIG. 1, this electrode foil 1 is long, and a surface expansion portion 3 is formed on both surfaces leaving a core portion 2 in the center in the thickness direction, and a plurality of divided portions 4 are formed on one or both of the surface expansion portions 3.
  • the dielectric film 5 is formed on the surface of the enlarged surface portion 3 and the dividing portion 4.
  • the enlarged surface portion 3 has a porous structure.
  • the porous structure consists of tunnel-like pits, sponge-like pits, or voids between dense powders.
  • the surface expansion portion 3 is typically formed by DC etching or AC etching in which a direct current or an alternating current is applied in an acidic aqueous solution in which halogen ions such as hydrochloric acid exist, or vapor deposition or sintering of metal particles or the like in the core portion. Is formed.
  • the electrode foil 1 includes a low-voltage electrode foil and a medium-high voltage electrode foil. Further, the remaining part excluding the expanded surface portion 3 of the valve metal, or the base material to which metal particles or the like are attached by vapor deposition or the like corresponds to the core portion 2. In other words, for example, the unetched layer or the base corresponds to the core 2.
  • the thickness of the enlarged surface portion 3 and the core portion 2 is not particularly limited, but the thickness of the expanded surface portion 3 is preferably in the range of 40 to 200 ⁇ m, and the thickness of the core portion 2 is preferably in the range of 8 to 60 ⁇ m.
  • the dividing part 4 divides the expanded surface part 3 in the depth direction from the surface of the electrode foil 1 toward the core part 2.
  • the dividing part 4 does not have to reach the core part 2 completely.
  • the dividing portion 4 is formed in the width direction orthogonal to the band longitudinal direction of the electrode foil 1.
  • the dividing portion 4 extends so as to completely traverse or partially traverse the electrode foil 1. That is, a certain part 4 extends from one long side of the electrode foil 1 and reaches the other long side. Moreover, a certain part 4 extends from one long side of the electrode foil 1 less than the foil center line or beyond the foil center line, and does not reach the other long side. Moreover, a certain part 4 extends from the other long side of the electrode foil 1 to less than the foil center line or beyond the foil center line, and does not reach one long side. Dividing parts 4 formed along the width direction may be connected to each other. The extending direction and length of all the dividing parts 4 do not need to be unified.
  • the dividing portion 4 cracks the expanded surface portion 3, tears the expanded surface portion 3, cuts the expanded surface portion 3 along the thickness direction of the electrode foil 1, cuts out the expanded surface portion 3, or the thickness direction of the electrode foil 1. It is formed by digging the enlarged surface portion 3 along the surface. Therefore, examples of the actual state of the dividing portion 4 are a crack, a split, a cut, a notch, or a dig. However, as long as the expanded surface portion 3 is divided, the aspect of the divided portion 4 is not particularly limited.
  • the groove width of the dividing portion 4 is 50 ⁇ m or less including 0 when the electrode foil 1 is flattened without being bent.
  • the groove width of the dividing portion 4 is a length along the longitudinal direction of the electrode foil 1 measured in the vicinity of the surface layer of the electrode foil 1.
  • the groove width of the divided portion 4 is substantially zero.
  • substantially 0 means a state in which the interface of the dividing portion 4 is at least partially in contact when the electrode foil 1 is flattened without being bent.
  • the groove width of the dividing portion 4 is 50 ⁇ m or less, a large decrease in the capacitance of the wound capacitor due to the decrease in the surface area of the dielectric film 5 is suppressed without impairing the flexibility and stretchability of the electrode foil 1. it can.
  • the dividing portion 4 As a method of forming the dividing portion 4, for example, it is conceivable to use physical means such as pressing the electrode foil 1 against a round bar. In the formation method using a round bar, the core part 2 of the electrode foil 1 extends in the longitudinal direction, and as a result, the thickness of the core part 2 is reduced. However, by setting the groove width of the dividing portion 4 to 50 ⁇ m or less, the thickness of the core portion 2 is not easily reduced, and the flexibility and stretchability of the electrode foil 1 are improved. Also in this respect, it is preferable that the groove width of the dividing portion 4 is 50 ⁇ m or less.
  • the dividing part 4 is provided in four or more places per 10 mm range in the strip longitudinal direction of the electrode foil 1.
  • the interval between the adjacent divided portions 4 may be an average pitch of 2.1 mm or less, and more preferably an average pitch of 1.0 mm or less. When the average pitch was 2.1 mm or less, it was confirmed that the exelin value was larger than that of the electrode foil 1 in which the dividing portion 4 was not formed.
  • the average pitch is arbitrarily selected from several sections along the longitudinal direction of the electrode foil 1, and the average value of the intervals between the four continuous divided portions 4 arbitrarily selected from each cross-sectional photograph is calculated. Furthermore, it calculated by taking the average value of each average value.
  • the interval between the divided portions 4 was obtained by measuring the vicinity of the surface of the electrode foil 1.
  • the dividing portions 4 may be formed with a uniform average pitch or a number within the unit range along the longitudinal direction of the electrode foil 1.
  • the average pitch and the number within the unit range can be changed in consideration of the curvature at the portion where the divided portion 4 is formed when the electrode foil 1 is wound. This is because the smaller the curvature, that is, the closer to the outer periphery when it is wound, the smaller the bending stress and the lower the risk of cracking.
  • the dividing portion 4 may be formed only in the winding start portion of the electrode foil 1 on the winding shaft.
  • the winding start portion of the electrode foil 1 has a large curvature and is likely to crack.
  • the average pitch may be increased in proportion to the winding radius at the location where the dividing portion 4 is located, or the number in the unit range may be decreased in inverse proportion to the radius. As the number of the dividing parts 4 decreases, the influence on the electrostatic capacitance of the wound capacitor decreases.
  • each of the divided portions 4 is formed on each of the enlarged surface portions 3 on both sides, but from the viewpoint of extending the electrode foil 1 at the time of winding, at least the outer side of the electrode foil 1 is wound and tension is applied. It is good to form in the enlarged surface part 3 to receive.
  • the dielectric film 5 is formed by subjecting the surface expansion portion 3 to chemical conversion, and typically uses an oxide film formed by applying voltage in a solution free of halogen ions such as an aqueous solution of adipic acid or boric acid.
  • the dielectric film 5 is also formed on the inner surface of the dividing portion 4.
  • the stability of the electrode foil 1 is increased.
  • the knowledge that if the dielectric film 5 is also formed on the inner surface of the dividing portion 4, the amount of electricity (A ⁇ s / F) required for the aging treatment for repairing the dielectric film 5 can be reduced. This is because of
  • the dielectric film 5 is also formed on the inner surface of the dividing portion 4. In other words, the unoxidized metal portion is also exposed from the groove surface of the dividing portion 4. Therefore, the amount of electricity required for the aging process is reduced.
  • the dividing part 4 is formed before the chemical conversion treatment, a smooth manufacturing process of the electrode foil 1 is realized. Therefore, preferably, after the formation of the enlarged surface portion 3, the dividing portion 4 is formed before the chemical conversion treatment. In this case, by forming a thin oxide before the dividing portion 4 is formed, the dividing portion 4 can be easily formed.
  • the dielectric film 5 can be formed on the surface of the divided portion 4 by performing a chemical conversion treatment before the dividing portion 4 is formed and performing a re-chemical conversion treatment after the dividing portion 4 is formed.
  • FIG. 2 is a schematic view showing a capacitor element 6 of a wound capacitor using the electrode foil 1, and is an example using an aluminum electrolytic capacitor.
  • the electrode foil 1, which is an anode foil, and the cathode foil 7 are superposed with a separator 8 such as paper or synthetic fiber interposed.
  • the separator 8 is overlapped so that one end thereof protrudes from one end of the electrode foil 1 and the cathode foil 7. Then, the separator 8 that has popped out is started to be wound first to create the core 9, and then the layers of the electrode foil 1, the cathode foil 7, and the separator 8 are wound around the core 9. .
  • the capacitor element 6 thus prepared is impregnated with an electrolytic solution when an electrolytic capacitor is formed, and is stored in a bottomed cylindrical outer case, and the anode terminal and the cathode terminal are drawn out and sealed with a sealing body.
  • a winding capacitor is adopted.
  • the capacitor element 6 produced in this way is used to produce a solid electrolytic capacitor, the electrolyte is formed after the aging treatment, and is accommodated in a bottomed cylindrical outer case, and the anode terminal and the cathode terminal are provided. By pulling out and sealing with a sealing body, a winding capacitor is used.
  • the parting part 4 is formed in the electrode foil 1, the stress to the core part 2 of the electrode foil 1 generated when the capacitor element 6 is wound is suppressed.
  • the amount of electricity (A ⁇ s) required for the aging treatment for repairing the dielectric film 5 of the electrode foil 1 of the wound capacitor is compared with the case where the dividing portion 4 is wound with the unformed electrode foil. / F) was found to be less.
  • FIG. 3 is a schematic diagram showing a state of the electrode foil 1 wound around the capacitor element 6.
  • the plurality of divided portions 4 share and accept bending stress, and the bending stress is dispersed in each divided portion 4. Therefore, it is suppressed that the stress which leads to the destruction of the core part 2 is applied to the electrode foil 1, the destruction of the core part 2 is avoided, and the electrode foil 1 is smoothly bent and wound without being bent.
  • Example 1 An electrode foil 1 showing this embodiment was prepared as follows. First, an aluminum foil having a thickness of 110 ⁇ m, a width of 10 mm, a length of 55 mm, and a purity of 99.9% by weight or more was used as a base material. And the enlarged surface part 3 was formed in both surfaces of this aluminum foil. Specifically, the aluminum foil was immersed in an acidic aqueous solution containing a liquid temperature of 25 ° C. and about 8% by weight of hydrochloric acid as a main electrolyte, and etching treatment was performed. In the etching process, an alternating current of 10 Hz and a current density of 0.14 A / cm 2 was applied to the substrate for about 20 minutes to enlarge both surfaces of the aluminum foil.
  • the dividing portion 4 was formed on the aluminum foil whose both surfaces were etched.
  • the dividing part 4 was generated orthogonal to the band longitudinal direction of the aluminum foil. Specifically, as a physical treatment method, a wrap angle indicating a width of a region where the round bar and the aluminum foil are in contact with a round bar of ⁇ 0.5 mm is set to 180 degrees, and the aluminum foil is pressed to divide the part. 4 was formed.
  • a chemical conversion treatment was performed to form a dielectric film 5 on the surface of the enlarged surface part 3 and the dividing part 4. Specifically, a voltage of 100 V was applied in a chemical solution of adipic acid at a liquid temperature of 85 ° C. and 15 wt%. The voltage was applied for about 20 minutes, and the dielectric film 5 having a withstand voltage of about 100 V was formed.
  • the expanded surface portions 3 having the dielectric film 5 are present on both surfaces of the core portion 2 with a thickness of 36 ⁇ m, respectively, and the thickness is 38 ⁇ m.
  • the core part 2 remained.
  • the groove width of the dividing portion 4 was 10 ⁇ m.
  • the divided portions 4 were formed by cracks, the average pitch of the divided portions 4 was 70 ⁇ m, and the number of the divided portions 4 per 10 mm range was 143.
  • Example 2 Using the same base material as in Example 1, the same etching treatment and chemical conversion treatment as in Example 1 were performed. About the formation process of the division part 4, it is the same conditions except having used the round bar of (phi) 6 mm. The order of the etching process, the forming process of the dividing portion 4, and the chemical conversion process was performed in this order as in Example 1.
  • the electrode foil 1 of Example 2 was provided with the same thickness of the core part 2, the enlarged surface part 3 and the dielectric film 5 as in Example 1.
  • the divided parts 4 were formed by cracking, the average pitch of the divided parts 4 was 220 ⁇ m, and the number of the divided parts 4 per 10 mm range was 45.
  • Example 3 Using the same base material as in Examples 1 and 2, the same etching treatment and chemical conversion treatment as in Example 1 were performed.
  • the conditions for forming the dividing portion 4 are the same as those in Examples 1 and 2, except that a round bar having a diameter of 13 mm is used.
  • the electrode foil 1 of Example 3 was formed by cracks in the divided portion 4, and the average pitch of the divided portions 4 was 950 ⁇ m, and the number per 10 mm range was ten.
  • Example 4 Using the same base material as in Examples 1 to 3, the same etching treatment and chemical conversion treatment as in Examples 1 to 3 were performed. The conditions for forming the dividing portion 4 are the same as those in Examples 1 to 3 except that a round bar of ⁇ 16 mm is used. As a result, the electrode foil 1 of Example 3 was formed by cracking in the divided portion 4, and the average pitch of the divided portions 4 was 2100 ⁇ m, and the number per 10 mm range was four.
  • Example 5 The same etching treatment and chemical conversion treatment as in Examples 1 to 4 were performed.
  • the conditions for forming the dividing portion 4 are the same as those of Examples 1 to 4 except that a round bar of ⁇ 22 mm is used.
  • the electrode foil 1 of Example 3 was formed by cracks in the divided portion 4, and the number of pieces per 10 mm range was three with an average pitch of 3100 ⁇ m of the divided portions 4.
  • Comparative Example 1 The same base material as in Examples 1 to 5 was used, and the same etching treatment and chemical conversion treatment as in Examples 1 to 5 were performed. However, the formation process of the parting part 4 is omitted, and the parting part 4 is not formed.
  • the electrode foil of Comparative Example 1 is provided with the expanded surface portions 3 on both surfaces of the core portion 2, and each expanded surface portion 3 has the dielectric film 5.
  • each of the expanded surface portions 3 provided with the dielectric film 5 has a thickness of 36 ⁇ m, and the core portion 2 has a thickness of 38 ⁇ m.
  • FIG. 7 is a graph in which the horizontal axis is the average pitch of the dividing portions 4 and the vertical axis is the Erichsen value.
  • the Erichsen value of Comparative Example 1 was 1.4 mm
  • the Eriksen value of Example 5 was 1.5 mm. That is, it can be seen that by providing the dividing portion 4, the bending stress during winding is dispersed, and the flexibility and stretchability of the electrode foil 1 are improved.
  • the average pitch of the divided portions 4 was 2100 ⁇ m or less, the Erichsen value was 1.7 mm or more, and a clear difference was generated compared to the case where the divided portions 4 were not formed. That is, it can be seen that by providing the dividing portions 4 with an average pitch of 2100 ⁇ m or less, the bending stress at the time of winding is well dispersed, and the electrode foil 1 is given good flexibility and stretchability.
  • the Erichsen value is 2.0 mm or more, which is a result that is remarkably superior to the case where the divided portions 4 are not formed. That is, it can be seen that by providing the dividing portions 4 with an average pitch of 950 ⁇ m or less, the bending stress during winding is very well dispersed, and the electrode foil 1 is provided with very good flexibility and stretchability. Furthermore, when the average pitch of the divided portions 4 is 220 ⁇ m or less, the Erichsen value is 2.6 mm or more, which is a result that is far superior to the case where the divided portions 4 are not formed.
  • FIG. 8 is a photograph of the wound electrode foil 1 of Example 1 and Comparative Example 1.
  • FIG. 8A when the electrode foil of Comparative Example 1 is wound, it can be seen that a large number of bendings are generated in various places around the core portion 9. In addition, it can be seen that a large number of bends are generated in various places even in the vicinity of the middle layer where the curvature increases away from the core portion 9. Further, it can be seen that a part of the outer periphery of the capacitor element 6 is also bent.
  • the diameter of the capacitor element 6 wound with the same length of electrode foil is expanded to 7.36 mm in the comparative example 1, whereas FIG. ), The radius of the capacitor element 6 wound with the electrode foil 1 having the same length was within 7.10 mm in Example 1.
  • the electrode foil 1 of Example 1 and the electrode foil of Comparative Example 1 were wound as an anode foil to produce a capacitor element 6.
  • the electrode foil 1 of Example 1 and the electrode foil of Comparative Example 1 both had dimensions of a width of 5.6 mm and a length of 125 mm.
  • An aluminum foil was used for the cathode foil 7.
  • Cellulose fibers were used for the separator.
  • the capacitor element 6 using the electrode foil 1 of Example 1 and the capacitor element using the electrode foil of Comparative Example 1 are impregnated with an electrolytic solution, housed in a bottomed cylindrical outer case, and an anode terminal and a cathode terminal are provided. It was pulled out and sealed with a sealing body.
  • an electrolytic solution a ⁇ -butyrolactone solution of amidinium phthalate was used.
  • a wound capacitor using the electrode foil 1 of Example 1 and a wound capacitor using the electrode foil of Comparative Example 1 were produced.
  • the fabricated double-wound capacitor was aged and the amount of electricity required for the aging treatment was measured.
  • the rated voltage was applied under the temperature condition of 100 ° C. to perform the aging process.
  • a change in current flowing between the anode terminal and the cathode terminal was measured.
  • the current value passed at the start of the aging process with respect to the double wound capacitors is the same value.
  • FIG. 9 is a graph showing the percentage of the current value at each elapsed time with respect to the aging process start time, with the current value at the start time of the aging process being 100%.
  • the current value starts to decrease without waiting for 2 minutes, and the current value reaches about 30% of the aging start time in about 3 minutes. Decreased.
  • the current value decreased in more than 2 minutes and less than 3 minutes, and the current value decreased to about 30% of the aging start point. Took about 5 minutes. That is, as shown in FIG.
  • Example 1 in Example 1, the current value starts to decrease more than 1 minute earlier than Comparative Example 1, and in the product of the current value and time from the start of aging to the lapse of 5 minutes, Example 1 It was confirmed that the amount of electricity required for the aging treatment was reduced in the wound capacitor using the electrode foil 1 compared to the wound capacitor using the electrode foil of Comparative Example 1.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

L'invention concerne une feuille d'électrode qui facilite l'expansion de la surface d'un film de revêtement diélectrique et qui ne provoque pas de fissure qui détruirait même une section centrale au moment de l'enroulement, un condensateur d'enroulement obtenu par enroulement de la feuille d'électrode, un procédé de fabrication de feuille d'électrode et un procédé de fabrication de condensateur d'enroulement. Une feuille d'électrode 1 est constituée d'une feuille de type courroie et comporte une section de dilatation de surface 3, une section centrale 2 et une pluralité de sections de séparation 4. La section de dilatation de surface 3 est formée sur la surface de la feuille, et la section centrale 2 est une partie restante excluant la section de dilatation de surface 3 dans la feuille. La section de séparation 4 s'étend dans le sens de la largeur de la courroie dans la section de dilatation de surface 3, divisant ainsi la section de dilatation de surface 3. La pluralité de sections de séparation 4 se partagent une contrainte de flexion lorsque la feuille d'électrode 1 est enroulée, empêchant ainsi la concentration de contrainte.
PCT/JP2017/013661 2016-03-31 2017-03-31 Feuille d'électrode, condensateur d'enroulement, procédé de fabrication de feuille d'électrode et procédé de fabrication de condensateur d'enroulement Ceased WO2017171028A1 (fr)

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EP17775559.2A EP3385968B1 (fr) 2016-03-31 2017-03-31 Feuille d'électrode, condensateur d'enroulement, procédé de fabrication de feuille d'électrode et procédé de fabrication de condensateur d'enroulement
KR1020187016990A KR101914071B1 (ko) 2016-03-31 2017-03-31 전극박, 권회형 콘덴서, 전극박의 제조 방법, 및 권회형 콘덴서의 제조 방법
CN202310252457.0A CN116230412A (zh) 2016-03-31 2017-03-31 电极箔、其制造方法、卷绕型的电容器及其制造方法
JP2017541141A JP6723252B2 (ja) 2016-03-31 2017-03-31 電極箔の製造方法、及び巻回形コンデンサの製造方法
CN202210290755.4A CN114628159A (zh) 2016-03-31 2017-03-31 电极箔、其制造方法、卷绕型的电容器及其制造方法
CN201780005120.2A CN108431916A (zh) 2016-03-31 2017-03-31 电极箔、卷绕型的电容器、电极箔的制造方法及卷绕型电容器的制造方法
US16/029,940 US10262807B2 (en) 2016-03-31 2018-07-09 Electrode foil, winding capacitor, electrode foil manufacturing method, and winding capacitor manufacturing method

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JP2016-072305 2016-03-31

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CN (4) CN110895996A (fr)
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JPWO2017171028A1 (ja) 2018-04-05
CN114628159A (zh) 2022-06-14
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EP3385968A4 (fr) 2019-01-02
US10262807B2 (en) 2019-04-16
JP2017224844A (ja) 2017-12-21
CN108431916A (zh) 2018-08-21
EP3385968B1 (fr) 2021-07-14
CN110895996A (zh) 2020-03-20
JP6338000B2 (ja) 2018-06-06
TWI687949B (zh) 2020-03-11
KR101914071B1 (ko) 2018-11-02
TW202004797A (zh) 2020-01-16
TW201810320A (zh) 2018-03-16
CN116230412A (zh) 2023-06-06
JP6337998B2 (ja) 2018-06-06
US20180315552A1 (en) 2018-11-01
JP6337999B2 (ja) 2018-06-06
JP2017224843A (ja) 2017-12-21
JP2017220678A (ja) 2017-12-14
TWI674600B (zh) 2019-10-11
KR20180075685A (ko) 2018-07-04

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